| 1 | # warnings.m4 serial 6
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| 2 | dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Simon Josefsson
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| 8 |
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| 9 | # gl_AS_VAR_APPEND(VAR, VALUE)
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| 10 | # ----------------------------
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| 11 | # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
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| 12 | m4_ifdef([AS_VAR_APPEND],
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| 13 | [m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
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| 14 | [m4_define([gl_AS_VAR_APPEND],
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| 15 | [AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
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| 16 |
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| 17 |
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| 18 | # gl_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS])
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| 19 | # ------------------------------------------------
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| 20 | # Adds parameter to WARN_CFLAGS if the compiler supports it. For example,
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| 21 | # gl_WARN_ADD([-Wparentheses]).
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| 22 | #
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| 23 | # If VARIABLE is a variable name, AC_SUBST it.
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| 24 | AC_DEFUN([gl_WARN_ADD],
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| 25 | dnl FIXME: gl_Warn must be used unquoted until we can assume
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| 26 | dnl autoconf 2.64 or newer.
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| 27 | [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
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| 28 | AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
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| 29 | AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
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| 30 | gl_save_compiler_FLAGS="$gl_Flags"
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| 31 | gl_Flags="$gl_Flags $1"
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| 32 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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| 33 | [AS_VAR_SET(gl_Warn, [yes])],
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| 34 | [AS_VAR_SET(gl_Warn, [no])])
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| 35 | gl_Flags="$gl_save_compiler_FLAGS"
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| 36 | ])
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| 37 | AS_VAR_IF(gl_Warn, [yes],
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| 38 | [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])])
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| 39 | AS_VAR_POPDEF([gl_Flags])dnl
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| 40 | AS_VAR_POPDEF([gl_Warn])dnl
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| 41 | m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
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| 42 | ])
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